Asian heavyweight having to lie (7)

I believe the answer is:

tibetan

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'asian' is the definition.
(Tibet is in Asia)

'heavyweight having to lie' is the wordplay.
'heavyweight' becomes 'titan' (synonyms).
'having' means one lot of letters goes inside another.
'to lie' becomes 'be' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'titan' placed around 'be' is 'TIBETAN'.

Can you help me to learn more?

(Other definitions for tibetan that I've seen before include "Himalayan language" , "Former nationality of citizen of Lhasa" , "from high land" , "From Lhasa, perhaps" , "Oriental" .)

I've seen this clue in The Daily Express.

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